Finding the Fourth Proportional to 28,428.76, 42,649.31 and 10,898.61

Step by Step Solution

1. Step 1: Write the proportion equation
   28,428.76 : 42,649.31 = 10,898.61 : x
2. Step 2: Convert to fraction form
   28,428.76/42,649.31 = 10,898.61/x
3. Step 3: Cross multiply
   28,428.76x = 42,649.31 × 10,898.61
4. Step 4: Simplify right side
   28,428.76x = 464,818,196.46
5. Step 5: Solve for x
   x = 464,818,196.46/28,428.76
6. Step 6: Final answer
   x = 16,350.28